Show:
Addition
Subtraction
Rounding
Estimating sum
Estimating Difference
100

45 + 87 = 

132

100

76 - 38 = 

38

100

Round 43 to the nearest tens

40

100

436 + 32 = 

440 + 30 = 470

400 + 30 = 430 


100

437 - 134 = 

400 - 100 = 300 

440 - 130 = 110

200

62 + 186 = 

248

200

83 - 15 =

68

200

Round 389 to the nearest hundreds

400

200

Daily Double! 

381 + 267 = 

400 + 300 = 700

380 + 270 = 650

200

643 - 329 = 

600 - 300 = 300 

640 - 330 = 310 

300

236 + 153 = 

389

300

163 - 49 = 

114

300

Round 555 to the nearest hundreds

600

300

402 + 279 = 

400 + 300 = 700

400 + 280 = 680

300

855 - 284 = 

900 - 300 = 600 

860 - 280 = 580    

400

405 + 488 = 

893

400

846 - 753 = 

93

400

Daily Double!

Round 746 to the nearest tens

750

400

684 + 160 = 

680 + 160 =  840

700 + 200 = 900


400

 765 - 342 = 

800 - 300 = 500 

770 - 340 = 430 

500

364 + 675 + 

1039

500

943 - 675 = 

268

500

Round 872 to the nearest 10

870

500

579 + 193 =

580 + 190 = 770

600 + 200 = 800

500

493 - 308 = 

500 - 300 = 200 

490 - 310 = 180